Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 17: Organic Semiconductors

HL 17.8: Vortrag

Dienstag, 19. März 2024, 11:30–11:45, EW 015

Polymer-Metal-Composite Films with Structural Anisotropy for Thermoelectric Applications — •Christian Gradl¹, Marie Siegert¹, and Jens Pflaum^1,2 — ¹Julius-Maximilians-Universität Würzburg, 97074 Würzburg — ²CAE Bayern, 97074 Würzburg

To address the intrinsic limitations of neat organic semiconductors in thermoelectric (TE) applications, the fabrication of composites offers a promising approach by synergizing the best properties of the individual components. Inducing spatial order within such composite films can further enhance their TE performance. We applied this concept to the crystalline 1D molecular p-type metal TTT₂I₃ which has intriguing potential for TE applications due to its high electrical and low thermal conductivity. Our research focuses on exploiting these TE properties in conjunction with the anisotropic spatial orientation of the microcrystals within PEDOT:PSS polymer films. The TTT₂I₃ crystals are grown by microspacing in-air sublimation on single crystal RbCl substrates under ambient conditions. The self-alignment of the microcrystals originates from the growth on the respective RbCl surface facet and, hence, can be modified by the specific choice of a certain surface orientation. Subsequently, the aligned TTT₂I₃ microcrystals were enclosed by a solution processed p-type conducting PEDOT:PSS layer to finalize the composite thin film preparation. By the analysis of the thermoelectric properties, we are able to highlight the role of the 1D organic metal additives and their anisotropic spatial alignment on the TE characteristics of the polymer-metal composite films.

Keywords: Polymer Composites; Organic Crystals; Structural Anisotropy; Thermoelectrics